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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9407678eb470bee2409927a2ee6c79ed6e8894c2e102d91a83499f1bcd32b52a' 
  AND token = '1GTY2Oq6FY1GM7Cc1hX2YWQsM0EDCNipBZmUoHYtbos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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