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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4d7788cb104eea5d5588675a6cd11363be0fd18b9693deb83c513fe224e33bde' 
  AND token = 'jIl+Qkgww3QEJitcXmNT3TXr0UQCnEZy0xP0j3wOj7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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