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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a1dfcd487ae4845212d5341a3008f87d052e904e6b868d9f752a454b2a14d8c7' 
  AND token = 'zHJhttzYK5UhrHA6UDccP5XRr9Ab4lXizS1IBHNemHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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