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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b1105919b4b64c2756fcf2a86d674eed656d0d02de2d758b2725b57c8e1b5a13' 
  AND token = 'RCce8zG7ZdvGkP1i6B2O5idxSmRrCwoL1L+ywYFKzkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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