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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '18bf764a0632b9aa1f6e77cae24fdc071c38e60f0e7c357ca73f8d5c1271ff72' 
  AND token = 'c2aWwAoconQPe0O4ujqgL8QFpEkg3lCyhDd1ByyhAc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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