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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '030f1e4ddd09a6025da61e402650810b377bdc6a0a15c2094269d1eda05a86b9' 
  AND token = 'UOibwOTh0U3t8NoI+462Yq2c5EDBCfml6QPpiDUQsDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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