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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4d785d58506a18e6c0227d9cf7648b8688767825e41f2017fc82374a804d9b8e' 
  AND token = 't8TPaabilw9JGTWSak9fSJyPgVSHyJGMJOur0/BdjMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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