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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'da12b491c831f7058c0c753bdb2577e993bec7959d0097639785b67acb915a48' 
  AND token = 'Km7CH7wDCf/R/GvjO5y5IBMt6RWK095DE+pPCjQK0bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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