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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7790e8bb3d12638b971cdc77c0dd94fd4b4550612bb45ea0d41ca0bbd100018d' 
  AND token = 'OcCMBIina+f1/pYCqOAnfR3S+ff/8iA8YQSH/rRMfnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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