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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6c8e10c529b13a1d0af9e22d49197b0ee869d10642d7f117625475f58fa1ca93' 
  AND token = 'U8zalAJUna2MDBoR8sKtfbbvZNEAY4SK5p9X8X98vxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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