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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '02b9392deb826b45611014ece2c400cd00dcf0c6d827fafc03d314c9f4db170a' 
  AND token = 'kTM1ziw5oCHWsnw5HueJ+7Iov+y4RoA5HHjxs0kze60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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