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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '674844a18fe2ae143bc9bae984af30a938b24be12201f8832b8b8a771ec01ef5' 
  AND token = 'ujO85SuhHWXzTW2PStTM9iQAHN2ykewDftkP3WEnuwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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