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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6e03e43ef7e31097ab1f7ae30daf4e2f211240a6a1e6a83f32a48a76830e50e' 
  AND token = '0jddQY4YZrUNTIdHTMiMrr0aScxDmdaWZ+ErO5cuR1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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