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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ad1e5b198a441a912dcc3acd5b10d54f974676bee661f95092e3cd7de7a81d7' 
  AND token = 'auFu2WRxiKGBNTdsHjtPJS8J9nyQQH4M+wGcZcx8V48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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