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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '30f1cc062157f6b0865dd48a10576e2f03fb8ddfd1adc788162eb0b39fe7ba07' 
  AND token = 'MAIuD6WIG7ZnCoD/S65u/06FilZUlgbpt+PfSH4OVAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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