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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e091c4fed80f4337ba00e3368fd0379a2b8af8191d173818d7abf255d6c2bb1' 
  AND token = 'uWUkoWhyTjzBcZyLTGftw0tboF0cLfJu3Vt0rHvPk7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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