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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3a0a678681232c7b89ce27df2d7f0387b138396bd8a096cc63b2b667bc353b59' 
  AND token = 'pEU8KovMAm+J3jwE04uf6xEO96JhbNplgLn5TahaUZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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