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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ffd5dbff80cff2c88838d18c74a85286212db7a58e6b3d7f8c9551aeb3d4e885' 
  AND token = '5063LLInwk5O6hha6m/TjRmH7PiYxelEBh7fP7V0gWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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