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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1b0b8b2caec3f04791099ec10a7657b0a4a58189f22af83b3e9fdc8f8049ea8e' 
  AND token = 'atFoMzP3V4JCIPJ9ly5H1r2chfpl0u3/OYGihnqh4Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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