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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '183f18217b122b18de2c0d43429002798a9a44bae316d98ab0e2cf9238e0d663' 
  AND token = 'qcfb0s4XWQBUXc2ry9E+Zhu5ZHUQDXoKRHD14KLjryA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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