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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5a3f523ae43c19d5be959fba45f291fb8a468b80b38b8563252b876a2e637578' 
  AND token = 'aCZuSImxAQKj0uN7Un3HAVRiwj1IqLS7gtEL/r9n6sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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