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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2960d5e46e33527c29008013a08ebe14bea166a6e6a0fa6ea38d59e8e6798980' 
  AND token = 'jPsDCu1/e2MADDTn42ByrCN0+v25K3Sdp+capUIEucA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}