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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '119c0c67b65b7baa033a1d6765ee16f3f23abf7997fa5eac1646d25dbc63af94' 
  AND token = '+6MhKMJQGdstlDuzd9Bimq4oBnKQOzupBihcPap0rac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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