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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc62a3a47672068d2ac3b4b1fcb48e75b8295fe1f3c38b60e2d54fa368fce5a2' 
  AND token = 'WtwjV9/eNtcxmIVyp6tlFP32mAwkm4i5z/8EqGi6ee8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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